CN101844031A - Foam desulfurization de-dusting method and desulfurization de-dusting tower thereof - Google Patents

Foam desulfurization de-dusting method and desulfurization de-dusting tower thereof Download PDF

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Publication number
CN101844031A
CN101844031A CN 201010189444 CN201010189444A CN101844031A CN 101844031 A CN101844031 A CN 101844031A CN 201010189444 CN201010189444 CN 201010189444 CN 201010189444 A CN201010189444 A CN 201010189444A CN 101844031 A CN101844031 A CN 101844031A
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China
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tower
absorption liquid
flue gas
pond
foam
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CN 201010189444
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Chinese (zh)
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CN101844031B (en
Inventor
汪家权
刘树军
胡淑恒
高芮
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合肥工业大学
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Abstract

The invention discloses a foam desulfurization de-dusting method, which comprises water bath impact absorption and tower-type absorption, and is characterized in that: flue gas is directly blown into absorption liquid in an impact tank by a high pressure fan; the flue gas subjected to impact absorption and washing enters a bubble tower positioned above the impact tank; the absorption liquid is parallelly conveyed to the upward sides of various levels of tower cores arranged in the bubble tower; the flue gas is fully contacted with the absorption liquid containing foam in the various level of tower cores, and is washed and absorbed level by level for purification; the purified flue gas carries the foam to enter a serially connected auxiliary tower, and is further desulfurized, defoamed, dehydrated and then discharged; and the absorption liquid parallelly returns the impact tank, flows to an adjacent settling pond for settlement so as to be recycled, and the absorption liquid is 1 to 3 weight percent alkali liquor and simultaneously contains 0.5 to 3 weight percent of surfactant. The method has the desulfurization rate of over 99 percent, and the flue gas completely meets the discharge standard regulated by the nation.

Description

A kind of foam desulfurization and dust-removal method and desulfurization and dedusting tower thereof

One, technical field

The present invention relates to a kind of fire coal boiler fume processing method and equipment, specifically a kind of desulfurization and dust-removal method and desulfurization and dedusting tower thereof.

Two, background technology

The wet process of FGD dedusting is to contain SO with the liquid-absorbant washing 2Flue dust, remove SO in the flue gas 2Technology with flue dust.Its technical characterstic is the end that whole desulfurization dust-removal system is positioned at the coal-burning boiler flue, and desulfurization and dedusting carries out in solution, and desulfurizing agent and reaction product are hygrometric state.The wet process of FGD dedusting is a kind of process of gas liquid reaction, and it is fast to have reaction speed, and treatment effect is good, absorbent utilization rate advantages of higher, thereby in the various technologies of flue gas desulfurization, be in leading position.

The wet process of FGD dedusting technology of having developed in the world at present has multiple, can be divided into tower washing deduster, whirlwind scrubber and Venturi scrubbing deduster according to its structure.Wherein the treatment effect of Venturi scrubbing deduster relatively better, but operation and maintenance cost is too high, is not suitable for middle-size and small-size smelter.And the treatment effect of tower washing deduster, whirlwind scrubber often also is difficult to reach the metallurgy industry standard limit of smog release of national regulation.

Three, summary of the invention

The present invention is directed to above-mentioned the deficiencies in the prior art, aim to provide a kind of new desulfurization and dust-removal method and equipment thereof, technical problem to be solved is that water-bath impact absorption method and foamed cleaning absorption process are combined to improve the efficient of desulfurization and dedusting.

This method also is a kind of Wet-type desulfurize and dust removing method, comprises water-bath impact absorption and tower absorption, it is characterized in that flue gas directly is blown in the absorption liquid that impacts in the pond by high pressure positive blower, at first removes thicker flue dust (dust) and the part SO of particle diameter in the flue gas 2Flue gas after impact absorption, washing enters and is arranged in the bubble tower (king-tower) that impacts the top, pond, absorption liquid is sent into the top of the tower cores at different levels that are provided with in the king-tower by parallel connection, flue gas fully contacts with the absorption liquid that contains foam at tower in-cores at different levels, purify through washing step by step, absorbing, flue gas after being purified is carried in the secondary tower that foam enters series connection together, further de-bubble after the desulfurization, the last emptying of dewatering, absorption liquid parallel connection are returned to impact the pond and flow to and are carried out sedimentation in the adjacent sedimentation basin to recycle.

Described absorption liquid is the alkali lye of concentration 1~3wt% (percentage by weight, down with), contains simultaneously O.5~surfactant of 3wt%, to form foam.

The used desulfurization and dedusting tower of this method comprises the king-tower and the secondary tower of series connection, and king-tower plays the desulfurization and dedusting effect, and secondary tower mainly plays de-bubble, dehydration, and difference with the prior art is:

1, king-tower is a kind of bubble tower, as shown in Figure 1.King-tower is positioned at the top of impacting pond 7, impacts and contains absorption liquids in the pond 7, is ramped shaped at the bottom of the pond and is communicated with sedimentation basin 8 bottoms, and at least three grades of tower cores are set in the tower body of king-tower (being shell) 1, and the tower core is made up of the inner bag 3 and the trunnion 4 of dividing plate 2 and symmetrical distribution on it.Inner bag 3 is the combined shaped of cylinder and arc top or the cylinder and the vertex of a cone, and Open Side Down, covers on the trunnion 4, and small sircle hole gathers on the courage wall of inner bag 3.Trunnion 4 is one section one section short tube that exceeds dividing plate 2 planes.There is gas outlet 9 on tower body 1 top, have inlet and the leakage fluid dram corresponding on the tower wall with tower core progression, each inlet is connected in parallel on the upper hose 5, upper hose 5 is connected with pump 10 outlets, each leakage fluid dram is connected in parallel on the downcomer 6, downcomer 6 is communicated with impact pond 7, and high pressure positive blower outlet 11 is immersed in the absorption liquid that impacts pond 7.

Flue gas is blown into the degree of depth of 10cm under the absorption liquid liquid level by the outlet 11 of high pressure positive blower, at first carries out impact absorption and washing, removes part SO 2The most of flue dust bigger with particle produces a large amount of foams simultaneously.Impact pond 7 connects between sedimentation basins 8, two ponds and separates with dividing plate, but the connection of dividing plate lower end, the feasible gradient inflow sedimentation basin 8 that impacts the flue dust of capture in the pond 7 by the bottom.Because the spacer function between sedimentation basin and the impact pond, it is less to make that sedimentation basin 8 is influenced by flow perturbation, and flue dust can more steadily precipitate.Overflows and enter in the king-tower in the flue gas self-absorption liquid after impact absorption, washing, advance, flow to bubbling chamber (being between inner bag and the inner bag and the cavity between inner bag and the shell), also rise step by step until cat head (as shown in Figure 3) from the small sircle hole on the courage wall by the opening of inner bag 3.

Absorption liquid pumps into upper hose 5 by sedimentation basin 8 and falls after by the arc top of delivering to tower in-core courages 3 at different levels in parallel or vertex of a cone top, pushed up by arc or vertex of a cone shunting is drenched and formed moisture film catch flue gas on the outer wall of inner bag 3, flue gas impacts moisture film and forms cyclonic fog, because the existence of surfactant in the absorption liquid, just can in the bubbling chamber, produce a large amount of foams, capture flue dust simultaneously.The foams mix of flue gas and generation enters next stage tower core together, continues to produce new foam.Before bubble burst, the flue gas in this infinitesimal and the absorption liquid of foam wall fully react, and remove SO wherein 2, and capture flue dust.Finish the absorption liquid that absorbs exchange and unnecessary absorption liquid and flow to downcomer 6 together with foam leakage fluid dram on tower body under the stopping of trunnion 4 and return and impact pond 7, after sedimentation basin 8 sedimentations are clarified, pump into upper hose 5 again and recycle.

For improving treatment effeciency, the small sircle hole that gathers on same inner bag 3 walls tilts to same direction, be that the center line of small sircle hole and the diameter of cylinder have an angle, make that flue gas is tangential to flow out and at the indoor generation eddy flow of bubbling, and between adjacent two courages at the clockwise and anticlockwise eddy flow of the indoor generation of bubbling, be that the small sircle hole incline direction is relative, change flue gas flow direction and form the flow disturbance foam is avoided forming fixedly gas circuit with the increase contacting efficiency.

Flue gas carries a large amount of foams and enters secondary tower from the gas outlet 9 of cat head after tower cores at different levels are handled in the ascension process.

2, secondary tower as shown in Figure 4, the tower body 1 of secondary tower is made of two cylindrical shells up and down that diameter does not wait, and the inverted inner bag 3 of two-stage at least is set in upper shell, promptly inner bag 3 openings upwards have the leakage fluid dram corresponding with inner bag 3 progression and are connected in parallel on the downcomer 13 on the barrel.Flue gas enters inner bag 3 together with foam from cat head air inlet 12, and the small sircle hole on the courage wall outwards blows out, and produces a large amount of new foams in by the wall of inner container small sircle hole again, makes absorption liquid can fully contact unreacted a small amount of flue gas in the king-tower, removes remaining SO 2And flue dust, flue gas sweeps along foam to import defoaming compartment (being lower shell) through wireway 14, and the flue gas after this froth breaking, processing is by evacuated tube 15 emptyings of defoaming compartment upper end.In two cylindrical shells up and down of secondary tower,, discharge by leakage fluid dram 16 together with the absorption liquid that produces in the defoaming compartment at last because the absorption liquid that bubble burst produces directly imports the defoaming compartment bottom by downcomer 13.

This method has been utilized impact, has been held back, inertial collision, diffusion, adhesive mechanism in foam desulfurization and dedusting process, utilizes the foam disturbance in the bubble tower to change the contacting efficiency that airflow direction increases flue gas and foam simultaneously.The used absorption liquid of system has added an amount of surfactant, has reduced its surface tension, makes it form a large amount of foams in by bubble tower, utilizes these foams to SO 2Capture with flue dust.System is stable, and desulfurization degree is up to more than 99%, and does not add the absorption liquid desulfurization degree less than 75% of surfactant, and sulfur content meets state specified standards fully in the discharged flue gas after treatment.

Four, description of drawings

Fig. 1 is a king-tower part section structural representation.Tower body is positioned at the top of impacting pond 7, and eight grades of tower cores are arranged in the tower body.

Fig. 2 is the A-A profile.Fix the inner bag 3 of seven symmetrical distributions on the dividing plate 2.

Fig. 3 is adjacent two-stage tower core part sectioned view.Arrow is depicted as the ascension route of flue gas, and absorption liquid is added in the top of each inner bag 3, and trunnion 4 stops that absorption liquid enters gas flue.

Fig. 4 is the cross-sectional view of secondary tower.

Sign in the accompanying drawing: 1 major and minor shell (tower body); 2 dividing plates; 3 inner bags; 4 trunnions; 5 upper hoses; 6 downcomers; 7 impact the pond; 8 sedimentation basins; 9 gas outlets; 10 water pumps; 11 high pressure positive blower gas outlets; 12 air inlets; 13 downcomers; 14 wireways; 15 evacuated tube; 16 leakage fluid drams.

Five, the specific embodiment

1, as shown in Figure 1.With metal processing king-tower internal diameter 2m, height overall 5.5m, in establish eight grades of tower cores, the high 60cm of individual layer, cat head is provided with gas outlet 9, has eight inlets and leakage fluid dram at Ta Bishang, inlet is connected in parallel on upper hose 5, its import is connected with pump 10 outlets, and on the leakage fluid dram downcomer 6 in parallel, its outlet is communicated with the impact pond 7 that is positioned at the king-tower below.Impact pond 7 bottom ramp shapes, separate with adjacent sedimentation basin 8 but the bottom is communicated with by dividing plate, the import of pump 10 is immersed in the absorption liquid of sedimentation basin 8, the surfactant neopelex that contains 2wt%NaOH and 2wt% in the absorption liquid, the outlet 11 of high pressure positive blower are immersed in 10cm place under the absorption liquid that impacts pond 7.

2, tower cored structure such as Fig. 2, shown in Figure 3.Seven centrosymmetric inner bags 3 are set on dividing plate 2, inner bag 3 is circular cone and cylinder combined shaped, the circular hole of densely covered diameter 0.5cm on the courage wall, the center line of circular hole and drum diameter is to same direction folder miter angle, and the flue gas that makes tangential outflow is at the indoor generation eddy flow of bubbling, and between adjacent two courages at the reciprocal eddy flow of the indoor generation of bubbling, flow to the contacting efficiency that the disturbance foam increases flue gas and foam with change, Open Side Down for inner bag 3, covers on the trunnion 4, and trunnion 4 exceeds dividing plate plane 3~5cm.

3, the secondary tower structure as shown in Figure 4.Tower body is made up of two cylindrical shells up and down that diameter does not wait, there is air inlet 12 on the upper shell top, be connected with the gas outlet 9 of king-tower, the inner bag 3 that the two-stage opening makes progress is set in the upper shell, have two leakage fluid drams on the barrel, two leakage fluid drams are connected in parallel on the downcomer 13, at the bottom of the through lower shells of downcomer 13 near the leakage fluid dram 16.The lower shell diameter is big than upper shell, constitutes defoaming compartment, and wireway 14 is set in it, and the cylindrical shell top is provided with evacuated tube 15.

Claims (3)

1. foam desulfurization and dust-removal method, comprise water-bath impact absorption and tower absorption, it is characterized in that: flue gas directly is blown in the absorption liquid that impacts in the pond by high pressure positive blower, flue gas after impact absorption, washing enters and is arranged in the bubble tower that impacts the top, pond, absorption liquid is sent into the top of the tower cores at different levels that are provided with in the bubble tower by parallel connection, flue gas fully contacts with the absorption liquid that contains foam at tower in-cores at different levels, purify through washing step by step, absorbing, flue gas after being purified is carried in the secondary tower that foam enters series connection together, further de-bubble after the desulfurization, the last emptying of dewatering; The absorption liquid parallel connection is returned to impact the pond and flow to and is carried out sedimentation in the adjacent sedimentation basin to recycle, and absorption liquid is the alkali lye of concentration 1~3wt%, contains the surfactant of 0.5~3wt% simultaneously.
2. the desulfurization and dedusting tower that foam desulfurization and dust-removal method as claimed in claim 1 is used, the king-tower and the secondary tower that comprise series connection, it is characterized in that: king-tower is positioned at the top of impacting pond (7), be ramped shaped at the bottom of impacting the pond in pond (7), impacting has dividing plate to separate between pond (7) and the adjacent sedimentation basin (8) but the bottom is communicated with; At least three grades of tower cores are set in the tower body of king-tower (1), the tower core is made of the inner bag (3) and the trunnion (4) of dividing plate (2) and symmetrical distribution on it, inner bag (3) is the combined shaped of cylinder and arc top or the cylinder and the vertex of a cone, and Open Side Down, and the small sircle hole that gathers on the courage wall; Gas outlet (9) is arranged at tower body (1) top, have inlet and the leakage fluid dram corresponding on the tower wall with tower core progression, inlet is connected in parallel on the upper hose (5), upper hose (5) is connected with pump (10) outlet, leakage fluid dram is connected in parallel on the downcomer (6), downcomer (6) is communicated with impact pond (7), and high pressure positive blower outlet (11) is immersed in the absorption liquid that impacts pond (7); The tower body of secondary tower (1) is made of two different cylindrical shells of diameter up and down, at least two-stage inner bag (3) is set in upper shell, inner bag (3) opening upwards, having the leakage fluid dram corresponding with inner bag (3) progression on the barrel is connected in parallel on the downcomer (13), the air inlet (12) on tube top is connected with the gas outlet (9) of king-tower, and wireway (14) is arranged in the lower shell, and there is evacuated tube (15) the barrel top,, there is leakage fluid dram (16) at the tube end, the bottom of the through lower shell of downcomer (13).
3. gas wash tower according to claim 2 is characterized in that: the small sircle hole that gathers on same inner bag (3) wall tilts to same direction, and the small sircle hole incline direction that gathers on adjacent two inner bags (3) wall is relative.
CN2010101894446A 2010-05-27 2010-05-27 Desulfurization de-dusting tower for foam desulfurization de-dusting method CN101844031B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102382700A (en) * 2011-09-05 2012-03-21 常州大学 Natural gas desulfurizing agent and preparation method thereof
CN102847423A (en) * 2012-08-31 2013-01-02 巩义市良慧环保机械设备厂 Catalytic double-alkali desulphurization and dust removal process
CN106914118A (en) * 2017-02-27 2017-07-04 常州大学 A kind of compound doctor solution of Novel lemon acid sodium

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2577939Y (en) * 2002-09-25 2003-10-08 柳州高新区铟泰科技有限公司 Multi-stage parallel scaleless flue gas desulfurizing tower
CN2598625Y (en) * 2003-03-14 2004-01-14 王淑文 City waterworks leaking chlorine absorption device
CN1478587A (en) * 2003-05-13 2004-03-03 魏叔坦 High efficiency foam type two-stage waste gas purifying device
CN101028586A (en) * 2007-01-29 2007-09-05 煤炭科学研究总院 Multi-phase bubbling reactor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2577939Y (en) * 2002-09-25 2003-10-08 柳州高新区铟泰科技有限公司 Multi-stage parallel scaleless flue gas desulfurizing tower
CN2598625Y (en) * 2003-03-14 2004-01-14 王淑文 City waterworks leaking chlorine absorption device
CN1478587A (en) * 2003-05-13 2004-03-03 魏叔坦 High efficiency foam type two-stage waste gas purifying device
CN101028586A (en) * 2007-01-29 2007-09-05 煤炭科学研究总院 Multi-phase bubbling reactor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102382700A (en) * 2011-09-05 2012-03-21 常州大学 Natural gas desulfurizing agent and preparation method thereof
CN102847423A (en) * 2012-08-31 2013-01-02 巩义市良慧环保机械设备厂 Catalytic double-alkali desulphurization and dust removal process
CN102847423B (en) * 2012-08-31 2015-06-03 巩义市良慧环保机械设备厂 Catalytic double-alkali desulphurization and dust removal process
CN106914118A (en) * 2017-02-27 2017-07-04 常州大学 A kind of compound doctor solution of Novel lemon acid sodium

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